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Experimental Paradigm for Measuring the Effect of Induced Emotion on Grammar Learning

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Examining demand effects on direct and indirect affect measures in affect induction procedures.

Mario Wenzel¹, Matthias Winkler¹, Jonathan Lasi¹

¹Abteilung Gesundheitspsychologie, Psychologisches Institut, Johannes Gutenberg-Universitat Mainz.

Emotion (Washington, D.C.)

|June 20, 2024

Summary

Psychological studies on affect induction are susceptible to demand effects. Contrasting related- with unrelated-studies designs revealed significant demand effects on self-reported positive and negative affect.

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Area of Science:

Psychology
Social Psychology
Cognitive Psychology

Background:

Affect induction procedures are common in psychological research.
Participants' self-reports of affect may be influenced by demand effects, where they infer the study's goal.
The unrelated-studies paradigm has been used to mitigate demand effects, but its impact on affect induction specifically is under-examined.

Purpose of the Study:

To investigate the extent of demand effects in affect induction procedures.
To compare the impact of related-studies versus unrelated-studies designs on affect measurement.
To determine if demand effects influence direct and indirect measures of affect.

Main Methods:

Six online experiments were conducted with a total of 1,841 participants.
A between-subjects design contrasted a related-studies condition with an unrelated-studies condition.
Participants' affect was measured after an affect induction procedure, with perceived study relatedness manipulated.

Main Results:

A related-studies design led to significantly greater increases in both positive and negative affect compared to an unrelated-studies design, indicating a demand effect.
Demand effects were also observed on an indirect measure: a smaller self-reported momentary thought-action repertoire in the related-studies condition.
No significant demand effects were found on memory performance or participant distrust.

Conclusions:

The design of psychological studies, specifically the perceived relatedness of tasks, can significantly influence affect induction outcomes.
Demand characteristics pose a notable challenge in affect induction research, affecting self-reported emotional states and cognitive measures.
Researchers should carefully consider study designs to minimize demand effects and ensure the validity of affect induction findings.